CA1144578A - Continuous self-locking spiral wound seal - Google Patents
Continuous self-locking spiral wound sealInfo
- Publication number
- CA1144578A CA1144578A CA000363626A CA363626A CA1144578A CA 1144578 A CA1144578 A CA 1144578A CA 000363626 A CA000363626 A CA 000363626A CA 363626 A CA363626 A CA 363626A CA 1144578 A CA1144578 A CA 1144578A
- Authority
- CA
- Canada
- Prior art keywords
- strip
- groove
- seal
- spiral wound
- gasket
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000463 material Substances 0.000 claims abstract description 26
- 230000000694 effects Effects 0.000 claims description 5
- 230000013011 mating Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
- F16J15/106—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure homogeneous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/002—Sealings comprising at least two sealings in succession
- F16J15/004—Sealings comprising at least two sealings in succession forming of recuperation chamber for the leaking fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L17/00—Joints with packing adapted to sealing by fluid pressure
- F16L17/06—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between the end surfaces of the pipes or flanges or arranged in recesses in the pipe ends or flanges
- F16L17/067—Plastics sealing rings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Geometry (AREA)
- Gasket Seals (AREA)
- Centrifugal Separators (AREA)
- Storage Of Web-Like Or Filamentary Materials (AREA)
- Package Frames And Binding Bands (AREA)
Abstract
Abstract A spiral wound seal for effecting a seal between two surfaces . The seal consists of a strip of gasket material wound into a groove machined into one of the surfaces. The gasket strip is wider than the groove is deep such that a portion of the gasket material protrudes from the groove. The seal is effected by clamping the second surface onto the first surface and thereby com-pressing the protruding gasket material.
Description
~1~4578 Description This invention relàtes to a spiral wound seal for maintaining a pressure between chambers of a wind tunnel.
Such a seal must meet severe criteria. It must be an active (opened and closed at intervals) large diameter (up to approximately 20 feet) pressure seal for use at cryogenic temperature. The seal must be effective at clamping pressures between 500 pounds per square inch (psi) and 2,500 psi. It must provide satisfactory sealing in a gaseous environment at temperatures between -320F and +200F and at pressures up to 130 psi above atmospheric.
As a further requirement, because of low accessibility in a wind tunnel to the ceal area, the seal must be manufactured in a relatively small size and assembled to its full size in the wind tunnel chamber.
Typlcally, there are three types of seal gasket con-flgurations: (1) one-piece, (2) segmented and (3) splral wound. Present one-piece configuration gasket construction is limited to relatively small diameters and construction of such seals of suitable material for cryogenic use is even more limited. Manufacturing capability of large diameter (up to approximately 20 feet) one-piece gaskets of sultable material is nonexistent.
Segmented gaskets with radial jo$nts consist of a number of short segments of gasket material typically with interlocklng ends. The pieces fit together to form a large gasket. These types of gaskets are ineffective because of short leak paths at the radial ~oints.
3 Construction of present spiral gaskets is limited to relatively small diameters. Typically, they are not single component configurations. Their design requires many parts, complicated machinery for fabrica~ion and a complicated technigue for assembly. The construction of spiral wound seals in the prior art consists of inner and outer metal rings along with an intermediate metal spiral strip separating .
~1~45~8 the gasket material in the spiral.
The paraphernalia used to retain the seal material i8 large and heavy, thus eliminating its use as a practical alternative in some applications. Specifically, this construction prohibits its use in wind tunnel applica-tions because access must be as large as the seal itself snd as previously pointed out most wlnd tunnels do no~
provlde such access. Also, large diameter seals of this construction are ineffective because differences in thermal expansion coefficients and other physical characteristics between the materials induce and accelerate degradation of the seal integrity when the seal is sub~ected to the severe wlnt tunnel environment.
In the present invention the skived strip of material forms the total gasket. There are no intermediate strips or rings to affect seal performance. A single material strlp 18 spiral wound lnto a groove in one of the ~ealed surfaces. The strip is wider than the groove is deep and thus protrudes from the surface. The opposing surface contacts and compresses the protruding strip portion to form a seal.
One known type of seal uses a single piece of material cut in the axial direction to form a spiral cut gasket, but this seal is used in a packing box around a shaft and 18 necessarily subjected to extreme compression from a gland to force the gasket material against the ~haft to effect a seal to preclude axial leakage along the shaft.
The strip seal eliminates several design weaknesses of large diameter cryogenic pressure seals. This invention eliminates the neces3ity of having to fabricate a gasket to its flnal diameter at the manufacturer and also elimi-nates the accompanying shipping and storage problems asso-ciated with large gaskets. Further, because the gasket is of such a small size before installation, access to the seal location can be small compared .o the seal final diameter, thus eliminating much overdesign and cost.
- , . ' ' ' ' -11~45~78 Therefore, this invention can be utilized at seal sites inaccessible to that of the prior art requiring complete gasket assembly during manufacture.
Inherent in the design of the spiral wound strip seal S is the elimination of radial joints of the segmented gasket. In a seal utllizing a segmented gasket wlth radisl ~oints the potential leak path is directly across the sesl. The potential leak path in the strip seal i8 between the winds of the spirally wound strip and has a length equal to several times the circumference. Thus, ln equal circumstances the chance for leakage of the spiral wound strip seal is only a minute fraction of the chance for leakage of a segmented radial joint seal.
Also, directly associated with the failure of seals using segmented gaskets in cryogenic applications is the shrinkage that occurs during the approximately 400F
temperature reductlon. In segmented seals this opens a gap between the Regments allowing leakage. In the pro-posed strip seal the thermal shrinkage tends to tighten the successive winds of the gasket strip upon themselves in the groove thereby enhancing the sealing capability.
The cost of the single strip seal is only a fraction of the cost of the methods used in the prior art. The seal gasket is composed of one component--the gasket material itself.
All lntermediate strlps, retaining rings, and mandrels for assembly are eliminated. The gasket i9 skived from a blank on a conventional machine lathe utilizing the two basic function~ of the machine, namely, turning and cross-feed. During manufacture there are no additional machinesettings or measurements required. There is no material wasted during fabrication. The finished seal i8 the same size as the original material blank.
Thick one-piece and segmented seals are inherently subject to warpage and damaging stresses. Using the spiral strip concept, a thick seal can be built up without warping because the individual strips are thin and the 11445'78 -4~
seal configuration tends to relieve the stresses.
Cutting a cross section through the seal shows the individual winds as columns which bend under a compression load. This configuration conforms to a warped surface better than a solid cross section as is in a one-piece seal or a segmented seal and improves sealing capability at low clamping pressures.
Thus, in accordance with the present teachings, a spiral wound seal is provided which comprises a first member which has a surface with a groove cut therein; a second member which has a surface adjacent to the first surface; a continuous strip of gasket material having a width greater than the depth of the groove, spirally wound into the groove and protruding therefrom; clamping means is provided to hold the surface of the second member against the strip with sufficient force to effect a seal between the surface of the first member and the surface of the second member; a recess is provided with-in a wall of the groove with an insert disposed within the recess and means provided coupled to the insert for securing the strip to the groove thereby precluding slippage o$ the strip relative to the wall of the groove.
In the drawings:
Fig. 1 is an elevational view of a wind tunnel util-izing the invention;
Fig. 2 is a cross-sectional view taken along line II-II of Fig. l;
Fig. 3 is a partial elevational view of a spiral wound seal; and ; 30 Fig. 4 is a sectional view taken along line IV-IV of Fig. 3.
Refer now to the drawings. Fig 2 shows two chambers, 12 and 14 of a wind tunnel separated by a wall 13 and having connecting aperture 15 and gate valve plate 16.
Continuous spiral wound gasket strips 10 and 10' form a seal between wall 13 and plate 16 to preclude mixing of ~- the atmoshperes of chambers 12 and 14.
, 1~44578 -4a-The preferred embodiment uses two gaskets, an inner one 10 and an outer one lO'. This double gasket arrange-ment allows insertion of a pressure tap 50 between the gaskets lO and 10' at area 30 for detecting leakage. If leakage occurs, pressure builds up quickly between the gaskets and is easily detected.
Refer next to Fig. l showing wall 13 and strips 10 from chamber 12. Outer gasket 10' completely encircles inner gasket 10 with area 30 lying therebetween. Studs 46 are rigidly attached to wall 13 and extend through plate 16. The studs 46 are used to tighten the plate 16 against the strips to effect the seal.
Fig. 4 shows a cross section of the spiral wound seal of the preferred embodiment. A groove 32 is machined into wall 13 and surrounds aperture 15. Gasket strip 10 ~.~ 44578 i8 made from polytetrafluroethylene filled with twenty-five percent glass fibers. When cut in a strip, this material is flexible, conforms to mating surfaces, and maintains its integrity under clamping pressures in the desired temperature range, -320F to +200F. The material i8 presently available from Chemplast Inc., Wayne, New Jersey,as material number GL25M. Strip 10 is wound into the groove 32 and has a width larger than the depth of groove 32 such that it protrudes therefrom. Mating protrusion 40 and notch 41 on opposi~e sides of strip 10 run the length of the strip to make adjacent winds self-locking and preclude intermediate winds from being pulled out of the groove under adverse conditions. Fig. 4 shows the individual winds of strip 10 as columns which may bend under a compression load. This configuration conforms to a warped surface better whan a solid cross section and improves sealing capability at low clamping pressures.
Sealing is effected by clamping plate 16 toward wall 13. This may be accomplished by any suitable means, such as nuts and studs 46 as shown in Figs. 1 and 2.
Fig. 3 illustrates the winding of strip 10 into groove 32. Strip 10 has a tapered first end 24 minimizing separation of the wlnding due to the unsupported length of the strip 10 upon passing thereover on the next wind.
The wedge 26 provide~ a restoring force to the tendency of the strip lO to separate along an unsupported length. Pin 20, ~hown in phantom, is secured to insert 18 and protrudes into strip 10 to hold and prevent its slippage in groove 32 as successive rings are wrapped. Strip 10 has notch 22 to accept insert 18 and is wound around a number of times until groove 32 is filled. Wedge 26, cut from strip 10, is inserted into groove 32 after end 28 of the strip to fill any remaining space.
Fabrication of the gasket strip, not depicted in the drawings, may be accomplished from a thin disc of suitable material by skiving (peeling) a continuous strip from the 11~4578 circumference of the disc. The disc is eut from stock of a size sufficient to make a one-piece seal. The disc is prepared by planing both faces parallel to a desired width and finishing them to a suitable smoothness. A
conventional lathe is used to turn the circular disc with the crossfeed setting giving the required thickness to the skivet strip. The strip is skived with a tool which imparts a notch on one side of the strip and a mating protrusion on the opposite side.
Alternatively the strip may have flat surfaces or the contact surfaces between the strips may be prepared with an adhesive, making the final assembly a bonded solid plece of material, or the strip may be of tubular construc-tion with ends constructed to allow pressurization after assembly. Large diameter bearings of a suitable material can be constructed in a manner identical to a seal. A
thermally controlled seal can be fabricated by imbedding a heater wire in a groove in the strip and wrapping the wire along with the seal strip.
In the preferred embodiment, aperture 15 ln wall 13 is circular as are inner seal 10 and outer seal 10'. However, the invention is not limited thusly and any shape aperture or seal may be chosen.
Such a seal must meet severe criteria. It must be an active (opened and closed at intervals) large diameter (up to approximately 20 feet) pressure seal for use at cryogenic temperature. The seal must be effective at clamping pressures between 500 pounds per square inch (psi) and 2,500 psi. It must provide satisfactory sealing in a gaseous environment at temperatures between -320F and +200F and at pressures up to 130 psi above atmospheric.
As a further requirement, because of low accessibility in a wind tunnel to the ceal area, the seal must be manufactured in a relatively small size and assembled to its full size in the wind tunnel chamber.
Typlcally, there are three types of seal gasket con-flgurations: (1) one-piece, (2) segmented and (3) splral wound. Present one-piece configuration gasket construction is limited to relatively small diameters and construction of such seals of suitable material for cryogenic use is even more limited. Manufacturing capability of large diameter (up to approximately 20 feet) one-piece gaskets of sultable material is nonexistent.
Segmented gaskets with radial jo$nts consist of a number of short segments of gasket material typically with interlocklng ends. The pieces fit together to form a large gasket. These types of gaskets are ineffective because of short leak paths at the radial ~oints.
3 Construction of present spiral gaskets is limited to relatively small diameters. Typically, they are not single component configurations. Their design requires many parts, complicated machinery for fabrica~ion and a complicated technigue for assembly. The construction of spiral wound seals in the prior art consists of inner and outer metal rings along with an intermediate metal spiral strip separating .
~1~45~8 the gasket material in the spiral.
The paraphernalia used to retain the seal material i8 large and heavy, thus eliminating its use as a practical alternative in some applications. Specifically, this construction prohibits its use in wind tunnel applica-tions because access must be as large as the seal itself snd as previously pointed out most wlnd tunnels do no~
provlde such access. Also, large diameter seals of this construction are ineffective because differences in thermal expansion coefficients and other physical characteristics between the materials induce and accelerate degradation of the seal integrity when the seal is sub~ected to the severe wlnt tunnel environment.
In the present invention the skived strip of material forms the total gasket. There are no intermediate strips or rings to affect seal performance. A single material strlp 18 spiral wound lnto a groove in one of the ~ealed surfaces. The strip is wider than the groove is deep and thus protrudes from the surface. The opposing surface contacts and compresses the protruding strip portion to form a seal.
One known type of seal uses a single piece of material cut in the axial direction to form a spiral cut gasket, but this seal is used in a packing box around a shaft and 18 necessarily subjected to extreme compression from a gland to force the gasket material against the ~haft to effect a seal to preclude axial leakage along the shaft.
The strip seal eliminates several design weaknesses of large diameter cryogenic pressure seals. This invention eliminates the neces3ity of having to fabricate a gasket to its flnal diameter at the manufacturer and also elimi-nates the accompanying shipping and storage problems asso-ciated with large gaskets. Further, because the gasket is of such a small size before installation, access to the seal location can be small compared .o the seal final diameter, thus eliminating much overdesign and cost.
- , . ' ' ' ' -11~45~78 Therefore, this invention can be utilized at seal sites inaccessible to that of the prior art requiring complete gasket assembly during manufacture.
Inherent in the design of the spiral wound strip seal S is the elimination of radial joints of the segmented gasket. In a seal utllizing a segmented gasket wlth radisl ~oints the potential leak path is directly across the sesl. The potential leak path in the strip seal i8 between the winds of the spirally wound strip and has a length equal to several times the circumference. Thus, ln equal circumstances the chance for leakage of the spiral wound strip seal is only a minute fraction of the chance for leakage of a segmented radial joint seal.
Also, directly associated with the failure of seals using segmented gaskets in cryogenic applications is the shrinkage that occurs during the approximately 400F
temperature reductlon. In segmented seals this opens a gap between the Regments allowing leakage. In the pro-posed strip seal the thermal shrinkage tends to tighten the successive winds of the gasket strip upon themselves in the groove thereby enhancing the sealing capability.
The cost of the single strip seal is only a fraction of the cost of the methods used in the prior art. The seal gasket is composed of one component--the gasket material itself.
All lntermediate strlps, retaining rings, and mandrels for assembly are eliminated. The gasket i9 skived from a blank on a conventional machine lathe utilizing the two basic function~ of the machine, namely, turning and cross-feed. During manufacture there are no additional machinesettings or measurements required. There is no material wasted during fabrication. The finished seal i8 the same size as the original material blank.
Thick one-piece and segmented seals are inherently subject to warpage and damaging stresses. Using the spiral strip concept, a thick seal can be built up without warping because the individual strips are thin and the 11445'78 -4~
seal configuration tends to relieve the stresses.
Cutting a cross section through the seal shows the individual winds as columns which bend under a compression load. This configuration conforms to a warped surface better than a solid cross section as is in a one-piece seal or a segmented seal and improves sealing capability at low clamping pressures.
Thus, in accordance with the present teachings, a spiral wound seal is provided which comprises a first member which has a surface with a groove cut therein; a second member which has a surface adjacent to the first surface; a continuous strip of gasket material having a width greater than the depth of the groove, spirally wound into the groove and protruding therefrom; clamping means is provided to hold the surface of the second member against the strip with sufficient force to effect a seal between the surface of the first member and the surface of the second member; a recess is provided with-in a wall of the groove with an insert disposed within the recess and means provided coupled to the insert for securing the strip to the groove thereby precluding slippage o$ the strip relative to the wall of the groove.
In the drawings:
Fig. 1 is an elevational view of a wind tunnel util-izing the invention;
Fig. 2 is a cross-sectional view taken along line II-II of Fig. l;
Fig. 3 is a partial elevational view of a spiral wound seal; and ; 30 Fig. 4 is a sectional view taken along line IV-IV of Fig. 3.
Refer now to the drawings. Fig 2 shows two chambers, 12 and 14 of a wind tunnel separated by a wall 13 and having connecting aperture 15 and gate valve plate 16.
Continuous spiral wound gasket strips 10 and 10' form a seal between wall 13 and plate 16 to preclude mixing of ~- the atmoshperes of chambers 12 and 14.
, 1~44578 -4a-The preferred embodiment uses two gaskets, an inner one 10 and an outer one lO'. This double gasket arrange-ment allows insertion of a pressure tap 50 between the gaskets lO and 10' at area 30 for detecting leakage. If leakage occurs, pressure builds up quickly between the gaskets and is easily detected.
Refer next to Fig. l showing wall 13 and strips 10 from chamber 12. Outer gasket 10' completely encircles inner gasket 10 with area 30 lying therebetween. Studs 46 are rigidly attached to wall 13 and extend through plate 16. The studs 46 are used to tighten the plate 16 against the strips to effect the seal.
Fig. 4 shows a cross section of the spiral wound seal of the preferred embodiment. A groove 32 is machined into wall 13 and surrounds aperture 15. Gasket strip 10 ~.~ 44578 i8 made from polytetrafluroethylene filled with twenty-five percent glass fibers. When cut in a strip, this material is flexible, conforms to mating surfaces, and maintains its integrity under clamping pressures in the desired temperature range, -320F to +200F. The material i8 presently available from Chemplast Inc., Wayne, New Jersey,as material number GL25M. Strip 10 is wound into the groove 32 and has a width larger than the depth of groove 32 such that it protrudes therefrom. Mating protrusion 40 and notch 41 on opposi~e sides of strip 10 run the length of the strip to make adjacent winds self-locking and preclude intermediate winds from being pulled out of the groove under adverse conditions. Fig. 4 shows the individual winds of strip 10 as columns which may bend under a compression load. This configuration conforms to a warped surface better whan a solid cross section and improves sealing capability at low clamping pressures.
Sealing is effected by clamping plate 16 toward wall 13. This may be accomplished by any suitable means, such as nuts and studs 46 as shown in Figs. 1 and 2.
Fig. 3 illustrates the winding of strip 10 into groove 32. Strip 10 has a tapered first end 24 minimizing separation of the wlnding due to the unsupported length of the strip 10 upon passing thereover on the next wind.
The wedge 26 provide~ a restoring force to the tendency of the strip lO to separate along an unsupported length. Pin 20, ~hown in phantom, is secured to insert 18 and protrudes into strip 10 to hold and prevent its slippage in groove 32 as successive rings are wrapped. Strip 10 has notch 22 to accept insert 18 and is wound around a number of times until groove 32 is filled. Wedge 26, cut from strip 10, is inserted into groove 32 after end 28 of the strip to fill any remaining space.
Fabrication of the gasket strip, not depicted in the drawings, may be accomplished from a thin disc of suitable material by skiving (peeling) a continuous strip from the 11~4578 circumference of the disc. The disc is eut from stock of a size sufficient to make a one-piece seal. The disc is prepared by planing both faces parallel to a desired width and finishing them to a suitable smoothness. A
conventional lathe is used to turn the circular disc with the crossfeed setting giving the required thickness to the skivet strip. The strip is skived with a tool which imparts a notch on one side of the strip and a mating protrusion on the opposite side.
Alternatively the strip may have flat surfaces or the contact surfaces between the strips may be prepared with an adhesive, making the final assembly a bonded solid plece of material, or the strip may be of tubular construc-tion with ends constructed to allow pressurization after assembly. Large diameter bearings of a suitable material can be constructed in a manner identical to a seal. A
thermally controlled seal can be fabricated by imbedding a heater wire in a groove in the strip and wrapping the wire along with the seal strip.
In the preferred embodiment, aperture 15 ln wall 13 is circular as are inner seal 10 and outer seal 10'. However, the invention is not limited thusly and any shape aperture or seal may be chosen.
Claims (8)
1. A spiral wound seal comprising:
a first member having a surface with a groove cut therein;
a second member having a surface adjacent to said first surface;
a continuous strip of gasket material having a width greater than the depth of said groove, spirally wound into said groove and protruding therefrom;
clamping means to hold the surface of said second mem-ber against said strip with sufficient force to effect a seal between the sur-face of said first member and the force of said second member;
a recess within a wall of said groove;
an insert disposed within said recess; and means coupled to said insert for securing said strip to said groove thereby precluding slippage of said strip relative to said wall of said groove.
a first member having a surface with a groove cut therein;
a second member having a surface adjacent to said first surface;
a continuous strip of gasket material having a width greater than the depth of said groove, spirally wound into said groove and protruding therefrom;
clamping means to hold the surface of said second mem-ber against said strip with sufficient force to effect a seal between the sur-face of said first member and the force of said second member;
a recess within a wall of said groove;
an insert disposed within said recess; and means coupled to said insert for securing said strip to said groove thereby precluding slippage of said strip relative to said wall of said groove.
2. A spiral wound seal as in Claim 1, wherein:
the surface of said first member is a wall between two chambers of a wind tunnel having an aperture for communication between the chambers;
said groove surrounds the aperture; and the surface of said second member is a gate valve plate of sufficient size to cover the groove.
the surface of said first member is a wall between two chambers of a wind tunnel having an aperture for communication between the chambers;
said groove surrounds the aperture; and the surface of said second member is a gate valve plate of sufficient size to cover the groove.
3. A spiral wound seal as in Claim 1, wherein said strip has a tapered end such that successive winds of said strip over said end experience a minimum deflection.
4. A spiral wound seal as in Claim 1, wherein said gasket strip is tubular providing a conduit.
5. A spiral wound seal as in Claim 1, further comprising:
at least one segment of gasket material for filling the portion of said groove unfilled by said strip.
at least one segment of gasket material for filling the portion of said groove unfilled by said strip.
6. A spiral wound seal as in claim 1, wherein said groove is rectangular in cross section, and wherein said strip is rectangular in cross section.
7. A spiral wound seal as in claim 1, wherein said strip has a protrusion and a mating notch such that said notch and said protrusion of successive winds mate.
8. A spiral wound seal as in claim 1, further comprising:
a second groove cut in the surface of said first member and surrounding said groove;
a continuous second strip of gasket material having a width greater than the depth of said second groove, spirally wound into said second groove and protruding therefrom; and said clamping means holding the surface of said second member against said first strip and said second strip with sufficient force to effect a seal therebetween.
a second groove cut in the surface of said first member and surrounding said groove;
a continuous second strip of gasket material having a width greater than the depth of said second groove, spirally wound into said second groove and protruding therefrom; and said clamping means holding the surface of said second member against said first strip and said second strip with sufficient force to effect a seal therebetween.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/096,257 US4309039A (en) | 1979-11-20 | 1979-11-20 | Continuous self-locking spiral wound seal |
| US96,257 | 1979-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1144578A true CA1144578A (en) | 1983-04-12 |
Family
ID=22256555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000363626A Expired CA1144578A (en) | 1979-11-20 | 1980-10-30 | Continuous self-locking spiral wound seal |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4309039A (en) |
| EP (1) | EP0029686B1 (en) |
| JP (1) | JPS5686263A (en) |
| AT (1) | ATE5831T1 (en) |
| CA (1) | CA1144578A (en) |
| DE (1) | DE3066107D1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4627799A (en) * | 1984-08-27 | 1986-12-09 | Sanden Corporation | Axial sealing mechanism for a scroll type fluid displacement apparatus |
| US4804196A (en) * | 1985-11-12 | 1989-02-14 | Sundstrand Corporation | Sealing assembly for a device having a rotatable shaft |
| US5348310A (en) * | 1992-12-28 | 1994-09-20 | The Dow Chemical Company | Double spiral-wound gasket assembly with leak detection |
| JP3369786B2 (en) * | 1995-04-19 | 2003-01-20 | サンデン株式会社 | Scroll compressor |
| US20060046841A1 (en) * | 2004-11-12 | 2006-03-02 | Walker Jay S | Budget-based flat rate play contract parameters |
| WO2005089275A2 (en) * | 2004-03-17 | 2005-09-29 | Garlock Sealing Technologies Llc | Staked retention of spiral windings for spiral wound gaskets |
| US20090253478A1 (en) * | 2008-04-04 | 2009-10-08 | Walker Jay S | Group session play |
| DE102015119188A1 (en) * | 2014-11-07 | 2016-05-12 | Trane International Inc. | tip seal |
| IT201700077191A1 (en) * | 2017-07-10 | 2017-10-10 | Mec Tre S R L | Seal system for fluids |
| CN116357888A (en) * | 2023-06-02 | 2023-06-30 | 常州市乐萌压力容器有限公司 | Safety interlocking device for quick-opening pressure vessel |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191503425A (en) * | 1915-03-03 | 1916-03-02 | Frederick Charles Goenner | A New Strip Packing or Jointing Strip. |
| US1527681A (en) * | 1922-09-02 | 1925-02-24 | Harry C Hanson | Piston ring |
| GB395969A (en) * | 1933-01-27 | 1933-07-27 | Packless Gland Company Ltd | Improvements in or relating to stuffing boxes |
| US2339479A (en) * | 1942-12-28 | 1944-01-18 | Frederick W Goetze | Composite gasket |
| US2580546A (en) * | 1947-07-02 | 1952-01-01 | Us Gasket Company | Jacketed gasket |
| GB732020A (en) * | 1952-08-07 | 1955-06-15 | Maschf Augsburg Nuernberg Ag | Improvements in gas-sealed joints between cylinder heads and cylinder blocks |
| FR1069978A (en) * | 1953-01-21 | 1954-07-15 | Gaskets manufacturing process | |
| US3057603A (en) * | 1958-03-11 | 1962-10-09 | Technicon Instr | Glass tube coil assemblies and heating baths |
| GB903409A (en) * | 1959-08-27 | 1962-08-15 | Walker & Co James Ltd | An improved gasket and the method of making the same |
| US3066823A (en) * | 1959-11-27 | 1962-12-04 | Westinghouse Electric Corp | Sealing constructions |
| NL106635C (en) * | 1960-02-04 | |||
| US3093383A (en) * | 1961-04-24 | 1963-06-11 | Wah B Lew | Rotary shaft face seal |
| US3926445A (en) * | 1972-05-04 | 1975-12-16 | Farnam Co F D | Convolutely wound gasket |
| SE7605256L (en) * | 1976-05-10 | 1977-11-11 | Stenberg Flygt Ab | WAREHOUSE |
| US4214761A (en) * | 1978-07-31 | 1980-07-29 | Utex Industries, Inc. | Packing construction |
-
1979
- 1979-11-20 US US06/096,257 patent/US4309039A/en not_active Expired - Lifetime
-
1980
- 1980-10-30 CA CA000363626A patent/CA1144578A/en not_active Expired
- 1980-11-13 DE DE8080304080T patent/DE3066107D1/en not_active Expired
- 1980-11-13 EP EP80304080A patent/EP0029686B1/en not_active Expired
- 1980-11-13 AT AT80304080T patent/ATE5831T1/en not_active IP Right Cessation
- 1980-11-20 JP JP16272780A patent/JPS5686263A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0029686B1 (en) | 1984-01-11 |
| ATE5831T1 (en) | 1984-01-15 |
| JPS5686263A (en) | 1981-07-13 |
| EP0029686A1 (en) | 1981-06-03 |
| US4309039A (en) | 1982-01-05 |
| DE3066107D1 (en) | 1984-02-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1144578A (en) | Continuous self-locking spiral wound seal | |
| US3664691A (en) | Pipe joints | |
| KR920006814B1 (en) | Fluid fitting with high temperature capabilities | |
| US4801158A (en) | Pipe joint | |
| US5131666A (en) | Zero clearance anti-extrusion rings for containment of ptfe packing | |
| KR880000594B1 (en) | Sealing device for bearing | |
| CA1067926A (en) | Ferrule for liquid tight flexible metal conduit | |
| EP0277724A2 (en) | Pressure balanced s-seal | |
| GB2250329A (en) | Flexible fluid conduit assembly with additional seal | |
| CA2191443A1 (en) | Synchronized dual thread connector | |
| US4676573A (en) | Clamp for hermetic cable connector | |
| CZ280498A3 (en) | Five-ring gland packing | |
| US4850599A (en) | Mechanical face seals | |
| US5913522A (en) | Spirally-bound flange seal with separate soft layers | |
| US20030102633A1 (en) | Seal ring | |
| US4788885A (en) | Housing consisting of at least two parts | |
| US3939551A (en) | Method of making polytetrafluoroethylene sealing elements with hydrodynamic action | |
| US2459370A (en) | Packing assembly | |
| US4832353A (en) | Ring seals | |
| US3442518A (en) | Packing for stuffing boxes | |
| US4441723A (en) | Duct seal | |
| US4234198A (en) | Water seal assembly for engines | |
| WO2007087643A2 (en) | Low stress / anti-buckling spiral wound gasket | |
| US4605248A (en) | Insulating union and method | |
| FR2517789A1 (en) | Composite pipe joint seals with elastic refractory spacers - pref. of expanded graphite or fibre filled thermosetting resin |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |